The 'Best Thing I Never Had' diva said that she was moved by the song, which features on West's 2010 album My Beautiful Dark Twisted Fantasy.
Beyoncé told Complex: "The fact that he's belting out his pain, his confusion, and his anger, with no pre-written lyrics, was so moving.
"He's singing his heart out for five minutes. He is so vulnerable. I love when an artist can be so honest."
The 29-year-old singer features on a track titled 'Lift Off' with West, as well as her husband Jay-Z, for their upcoming collaborative album Watch The Throne, which is due to be released on August 5.
> Beyoncé: 'I can tell a hit song right away'
Watch the music video for Kanye West's 'Runaway' below: